"Tired of two-slot graphics cards dominating your system internals? Bad news, then: the PCI Express SIG is preparing for three-slot graphics cards that may consume up to 300 watts just by themselves.

The PCI Special Interest Group is...detailing the shift to PCI Express 3.0 in roughly 2010...Why do we need such a spec? As of now, the 150-watt spec is no longer sufficient, according to the SIG. Besides the 2x3 connector defined in the 150W Graphics Spec 1.0, a new 2x4 connector is being defined for delivering power to the 225/300W cards."